Zigzag mechanism for sewing machines



Aug. 28, 1923. ma ma R. M. SHARAF I ZIGZAG MECHANISM FOR SEWING MACHINES Original Filed April 2, 1917 2 Sheets-Sheet 1 2 Sheets-Sheet 2 R M SHARAF ZIGZAG MECHANISM FOR SEWING MACHINES Original Filed April 2, 1917 Aug. 28, 1923.

- citizen of the United Patented Aug, 28, 1923.

mire: M. snaimr, omniw YORK, n1

' entree same earner ori ice.

, V, I, nssmn mo n, salien -intense 605., or'nos'ron, MASSACHUSETTS, A CORPORATION or nassncHusn'rrs;

ZIGZAG m nsw ar roe snwme MACHINES,

Appficat'flmmm April 2,- 191-7, Serial no. 159,052,

To all whom it may concernf u Be it known thatl, RALr'n M, SHAM a States, and a'resident of the borough of the Bronx, in the city and State of New York, have invented certain new and useful Improvements in Zigzag Mechanism for Sewing Machines, of which the following'is a specification.

The present invention relates to zig-zag mechanism forsewing machines, and more particularly sewing machines of the two needle type. It is an object of the present invention to provide an improved zig-zag mechanism operable primarily by spiral gears, and with which the hooks or loopers will be accurately and synchronously operated in connection with the wig zag'ging of the needles.

lVith these and other objects in Vie-W, an embodiment of my invention is shown in the accompanying drawings,,and. this embodiment will be more fully described hereinafter' with reference thereto, and vention will be finally pointed out in the claims;

In the accompanying drawings;

Figure 1 is a top view with parts broken away, also showing the means for zig zagging' the needles;

Figure 2 is a side View of the same;

Figure 3 is afront end view thereof;

Eigurei' is a side view partly in elevation and partly in section of the loopersg Figure?) is a top view partly in elevation and partly in section of the loope-rs, taken along the line m -mot Figure 4, and

Figure 6 is a view ofthe" inner side of one of the loopers.

Similar reference characters indicate corresponding parts throughout the several figures of the drawings.

Referring to the drawings the'sewingmachine head, which is of the usual type,- is shown partly w in dotted lines and is provided with a drive shaft 10 extending. there- I through, and having. two spiral gears 11 and 1-2 thereong the: gear 11 engaging a'late rally disposed gear 13 supported upon a suitable bracketwithin the-head, and having a ratio to the gear 11, oil te 2, whilethe gear 12 engages a later-ally disposed gear: 14, upon the in- Renewed m 13,1921. Serial- No; 484,509.

the upper end of an upright shaft 15 and:

having a ratio to the ge'arl2 of 1 to 1. YA

cam 16 is carriedby the shaft of the gear 13', and a rod 17 having a slot 18, 'slidably engages the saidshaft and is provided with.

rollers 19 and 20 whichengage the cam, at

either side thereof, the rotation of the cam, thereby causing the said rod 17 to recipca -V V I v I v The forward end of the rod 17 ispivotally connected tea-lever 2-1,*1nounte d upon -asupporting bracket 22, and pivotal about the 7 19111 23. The arm of the lGVIQl-jSj provided with an arcuate slot 24; in'which is secure pivota-lly by a nut 25 the inner end of a rod 26, the outer end nected by ascrew 2'7 hetween lugsj28 and 29 of the swinging frame 30. The frame 30 is hingedly supported between bearings: 31 and 32, and is curved outwardly as shown in Figure 1- to embrace the; p'resse-r, foot bar 33 indicated in dotted lines. v Upper and lower hearings and 35 are provided on the frame 30',- 111' which is reciproeatingly mfiountjed the needle harlgfi provided at, its end with of which islpivot-ally con the two" needles 37 and 38,;and adaptedto be reciprocated by the; arm 39,- pivotally c'onnected to the clamp 40 of the needle; bar at one end, and to the rotating drum 41 at the other end,thesai d drum $1 being carried at the end of the shaft 10. It will-be seenthat as the needle bar descends twice, the frame 7 30' is moved outwardly and inwardly once.

By looseningthe nut; 25 and changing the position thereof in the slot 24:," 1111'8 throw:

of the rod 26 may be changed and the amount of the zig-zagz regulated. As the slot extends over the'pivot point 23, the nut may he brought directly over the same so that there will be no movementofthe frame 30, and hence no zigzag action; v

Beneath the base plate of the machine, a counter-shaft50 is mounted at one end in thebearing support- 51, and is operated from the drive shaft 10 by a spiralgear52jat the lower endof; the vertical shaft 15 ,-Ineshing I with a'spiral gear 58fon the said shaft 5 0, causing-the same-to move equally with the driving shaft.

A looper driving shaft 54 is rnountedbetweenthe bearing J-support .51 and the and alateral movement, a looper cooperat-' ing with said needle, a support in which said looper is journaled, pivotal means on I which said support is mounted torock about an axis intersecting the axis about which the looper turn and means for rocking said support to shift the looperlaterally in correspondence to the lateral movements 0 the needle.

l. A. zig-zag mechanism for sewing ma chines, comprising a needle, means for imparting thereto a longitudinal reciprocation and a lateral movement, a looper cooperating with said needle and mounted to turn about an axis extending lengthwise with reference to the needle, a support inwhich said looper is j ournaled and which is mounted to swing about an axis intersecting the one about which the looper turns, and means for rocking said support to shift the looper laterally in correspondence to the lateral movements of the needle.

5. A zig-Zag mechanism for sewing machines, comprising a needle, means for imparting thereto a vertical reciprocation and a lateral movement, a looper cooperating with said needle, an upright shaft to the up-.

per portion of which said looper is secured,

looper-driving mechanism connected with the lower portion of said shaft, asupport in which said shaft is journaled, mounted to swing about a horizontal axis located below the looper but above the driving connection at the lower portion of said shaft, and means for rocking said support to shift the looper laterally in correspondence to the lateral movements of the needle. 6. A zigzag mechanism for sewing machines, comprising a needle, means for imparting zigzag movement to the needle, means for reciprocating the needle, a looper for cooperation with said needle, means for rotating the said looper twice for each up and down movement of the needle, pivoted means for supporting said looper, a cam shaft, reciprocating means engaging the said cam shaft and adapted to have to and fro movement, means. on said reciprocating means engaging said pivoted means and adapted to-move the same about the pivots thereof-during the to and fro movement of said reciprocating-means to move the said looper synchronously with the zigzag movement of the needle, the axis of rotatlonof the looper moving ina vertical plane.

7. A zig-zag mechanism forsewing machines, comprising a needle, means for imparting zig-zag movement pivoted means supporting said looper, a reciprocating member, means for intermittent- 1y reciprocating said reciprocating member vertically, and means inclined to the direction of movement ofsaid reciprocating member and actuated by the movement of said reciprocating member and adapted to pivotally move the said. supporting means of the looper; '8. A

chines comprising a needle, means for imparting zigzag movement to sa1d needle,

means for'reciprocating said needle, a loopto the needle, means for reciprocating the needle, a looper,

zigzagmechanism for'sewing ma er, means for rotating the said looper twice for each up and down movement of the needle, and means for. intermittently moving said looper to and fro to correspond to the movement of said needle and stopping the V I said movement at the ends of the to and fro movement and'intermittently at an intermediate stage of both said to and said fro movement.

9. A zig-zag mechanism for sewing ma chines, comprising a needle,rmeans for imparting thereto a longitudinal reciprocation and a lateral movement transversely to the line of feed of the work, a looper cooperating with said needle, a pivoted support in which said looper is journ'aled, a reciprocating member, and means on said reciprocating-member to engage the pivoted support and rock the same on its pivot trans versely to the line of feed of the work to move the looper in correspondence to the lateral movement of the needle, the central axis of said looper being movable in a vertical plane during said rocking movement.

10. A zig-zag mechanism for sewing ma-' chines, comprising a needle, means for imparting thereto a longitudinal reciprocation and a lateral movement transversely to the line of feed of the work, a looper cooperating with said needle, a pivoted support in which said looper is journaled, a reciprocating member, and cooperating portions on said support and on said member, having an effective line of action disposed obliquely to the path of said memben'to rock said sup-- port on its pivot transversely to the line of feed of the work and movethe looper in correspondence to the lateral movement of the needle,the central axis of said looper,

being movable in a vertical plane during said rocking moveme 11. In a zigzag mechanism for sewing machines, the combination of a drive shaft, a counter shaft, a cam shaft, a gear connection between the cam shaft and the drivefshaft, as my invention, I have signed my: name in needle oscillating means connected to the presence of two vsubscribing Witnesses. cam shaft, 21 looperj horizontally pivoted, I r V and a mechanism connected to. the ,counter- 'RALPPLB/L SHARAF.

5 shaft for operating the same rand oscillat Witnesses: v ing 1t upon its pivot. V 1) LEWIS MATTERN, 7 y in test1mony, that I claim the; foregoing -MOE- M. WEVINBERG. 

